7 gal 1 qts = 7*4 + 1 = 29 qts 2 gal 3 qts = 2*4 + 3 = 11 qts so diff = 29 - 11 = 18 qts = 4 gal 2 qts.
6 gal = 24 qts
21 gal.
1 gal = 4 qts; 2 gal = 8 qts
24 qts - 7 qts = 17 qts = 4 gal 1 qt.
8 qts = 2 gal 1/2 of 8 qts = 1 gal
3 gal, 2 qts
4 gal and 2 qts
4 qts
432 qts
4 qts
4 qts = 1 gallon 32 qts = 8 gallons